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A novel protocol of interrogation based on coherent population trapping in anN-level scheme atomic system leads to dark resonances involving three differentphotons. An ensemble of several hundreds of radiofrequency-trapped ions isprobed by three lasers simultaneously locked onto the same optical frequencycomb, resulting in high-contrast spectral lines referenced to an atomictransition in the THz domain. We discuss the cause of uncertainties andlimitations for this method and show that reaching a sub-kHz resolution isexperimentally accessible via this interrogation protocole.

Experimental Demonstration of a Terahertz Frequency Reference based on Coherent Population Trapping